The Martian Security Force
Though there are several under-branches and divisions throughout MarSec (as it is commonly known), it is divided into 2 basic branches: Civil Security (sometimes called the Feds) governing over planet-wide law enforcement and the Navy charged with planetary defense. Because Mars has vested interests throughout the solar system, MarSec ships and troops can be found in many off-Mars locations. MarSec remains the largest military force in the solar system, especially since the buildup in the early 80s due to Earth’s aggressive foray back into the solar system. However, recent budget cuts have somewhat weakened it.